Electric pump-governor.



W. V. TURNER.

ELECTRIC PUMP GOVERNOR. APPLICATION FILED Nov 25, 19l4.

1, 169,305, Patented Jan. 25,1916.

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L "a "WWW. "R! W 5 i1 I s 5 6 l 3 WITNESSES INVENTOR WALTER V. TURNER,OF EDGEWOOD, PENNSYLVANIA, ASSIGNOB TO THE WESTING- HOUSE A111 BRAKECOMPANY. F

01: PENNSYLVANIA.

WILMERDING, PENNSYLVANIA, A CORPORATION ELECTRIC PUMP-GOVERNOR.

Specification of Letters Patent.

Patented Jan. 25, 1916.

Application filed November 25, 1914. Serial No. 873,892.

To all whom it may concern:

Be it known that I, M rna V. TURNER, a citizen of the United States.residingat Edgewood, in the county of Allegheny and State ofPennsylvania, have invented new and useful Improvements in ElectricPump- Governors, of which the following is a specification.

This invention relates to electric pump governors, and more particularlyto the type shown in Patent No. 1,036,886 of H. M. P. Murphy, datedAugust- 27, 1912, and in which the operation of the governor is'effectedby means of puppet valves.

The principal object of my invention is to provide an improved governorof the above type, in which possible effect of wear and consequentleakage in producing unsatisfactory operation, is reduced to a minimum.

in the accompanying drawing. the single figure is a central verticalsection of an electric pump governor embodying my improvements.

As shown in the drawing, the pump govcrnor may comprises casing 1 havingapiston chan'iber 2 containing apiston 3 for opcrating a pumpcontrolling device or switch 4, the switch piston 3 being subjectto thepressure of a spring 5 tending to close the switch 4.

Fluid from the pump or storage reservoir is supplied through pipe 6 andpassage 7 to the inner face of a cut-in valve piston 8 subject on theouter face to the pressure of an adjustable spring 9 tending to shiftthe valve piston to a seat 10. Fluid under pressure also flows throughpassage 7 to the inncr face of a cut-out valve piston 11 which isnormally held to a seat 12 by the action of an adjustable spring 13.

The spring chamber 14 of the cut-out valve piston 11 is provided with apassage 15 having branch ports 16 and 17 controlled by the movement ofthe cut-in valve piston S and when the cut-out valve 11 is on its seat12. communication is open from spring chamber 11 through ports18,annular groove 1 and passage 20 to the switch piston chamber The springchamber 21 containing the cut-in spring 9 is open to a restrictedatmospheric exhaust port and when the vulvc piston 8 is or? its rearseat 23, communication is open from the spring chamber 21 through apassage 24 to the switch piston chamber 2.

The tension of the springs 9 and 13 may be substantially equal and thearea of the cut-out valve piston 11 exposed to pump pressure at the seat12 bein greater than the exposed area of the cut-1n valve piston 8, asthe pump pressure rises, the cut-out valve piston 11 will be unseatedbeforethe cut-in valve piston. As soon'as the cut-out valve piston 11lifts from its seat 12, the full area thereof is exposed to pumppressure, so that the same quickly moves to the extreme cut-outposition. The movement of the cut-out valve piston uncovers passage'25,so that fiuid'at pump pressure is admitted to the chamber 26 and sincethe full area of the cut-in valve piston 8 is now subject to pumppressure, the resistance of the spring 9 is overcome, and the cut-invalve piston is then quicklyshifted to its rear seat 23. In thisposition, the escape of fluid from chamber 27 to chamber 21 and exhaustport 22 is prevented. v v

Vhen the cut-in valve piston 8 moves to its rear seat 23, port '1? isuncovered, so that fluid at pump pressure can flow from chamber 26,through port'17 and passage 15 to the cut-out spring chamber 14. T hefluid pressures on opposite sides of the cut-out valvev piston 11 arethus equalized, thereby permitting the spring 13 to shift the cut-outvalve piston to its seat 12. The cut-in valve piston 8 remains in thecut-out position and fluid at pump pressure can therefore flow throughport 17, passage 15, ports 18, groove 19, and passage 20 to the switchpiston chamber 2, forcing the switch piston 3 and the switch 4 to thecut-out position and stopping the compressor. The cut-in valve piston 8will remain in cut-out position until the pump pressure acting inchamber 26 has fallen to a point at which the spring 9 exerts thebalance of power and then the valve piston 8 hits from its seat 23. Thisallows fluid at pump pressure flowing from the piston chamber 2 throughpassage 24 to enter the spring chamber 21 and since the exhaust port 22is restricted, the pressure in said chamber will build up to a pointsuch that the quick movement of the cut-in valve piston 8 to its seat 10is effected by the spring 9. In this position, fluid also e. haus'tsfrom piston chamber 2 through passage 20, groove 19, ports 18, passage15, chamber 27, to spring chamber 21 and exhaust port 22, so that fluidis quickly released fronrthe switch piston chamber 2 and the switchpiston with the switch 4 are shifted to cut-in position by the spring 5,again starting the compressor. I

In the cut-out position of the cut-out valve piston 11, a groove 28connects passage 25 with an annular groove 29 in the valve piston whichcommunicates with a passage 30, leading to the passage 2-1, so thatleakage past the seat 12 can escape, either through the exhaust port 22or to the spring chamber of the switch spring 5, which is open to theatmosphere. This will also permit escape of leakage past the seat 10into chamber 26, so that leakage past either the cut-out or the cut-invalve pistons will be provided for and thus erratic action or prematureoperation of the governor prevented.

It will be noted that fluid is not admitted to the switch piston untilthe cut-in valve piston 8 has shifted to cut out position and thecut-out valve piston 11 has been returned to the normal position on theseat 12, so that movement of the switch piston to cut-0ut position isassured regardless of possible leakage past the valve pistons.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A pump governor comprising a pump controlling device, a piston foractuating said device, a cut-in and a cut-out valve piston each having acut-in and a cut-out position, communication through which fluid isadmitted to the control piston being established when the cut-in valvepiston is in its cut-out position and the cut-out valve in its cut-inposition.

2. A pump governor comprising a pump controlling device, a piston foractuating said device, a cut-in valve piston subject to the opposingpressures of the pump and an adjustable spring and operated by pumppressure for opening a communication through which fluid is admitted tothe control piston, and a cut-out valve iston subject to the opposingpressures of the pump and an adjustable spring and operated by thespring for also opening said communication. I

3. A. pump governor comprising a pump controlling device, a piston foractuating said device, a cut-out valve piston subject to the opposingpressures of the pump and an adjustable spring for controlling a passagethrough which fluid is admitted to the control piston, and a cut-invalve piston sub ject to the opposing pressures of the pump and anadjustable spring contained in a spring chamber having a restrictedexhaust port and adapted in one position to admit fluid to said passageand in another position to open communication between the springchambers of the cut-in and cut-out springs.

l. A puinp governor comprising a pump controlling device, a piston foractuating said device, a cut-out valve pistonsubject to the opposingpressures of the pump and an ad ustable spring, and a cut-in valvepiston subject to the opposing pressures of the pump and an adjustablespring and operated upon movement of the cut-out valve piston to cut-outposition to admit fluid to a passage for supplying fluid to the control,piston, the cut-out valve piston beingshifted upon movement of thecut-in valve piston to the fluid supplying position, to a position inwhich communication is opened through said supply passage to the controlpiston.

In testimony whereof I have hereunto set my hand.

WALTER V. TURNER. lVitnesses A. M. CLEMENTS, S. V. KEEPER.

